Internal-combustion engine



Aprii s, 1924.

E. TUTTLE INTERNAL COMBUSTION ENGINE Filed Sept. 12 1921 2 Sheets-Sheet 1 QE W M\%7/ EIITLEI' TLLTIIIE 'llll April? 8 192 .1.

1,489,863 E. TUTTLE INTERNAL COMBUSTION ENGINE Filed Sept. 1 2 l9i 2 Sheets-Sheet 2 l l| I atented Apr. 8, lg i.

o ear ELEEEE TUE, OF EGO, WIfiGONfiIN.

NTERNAL-COUSTION ENGINE.

Application filed September 12, 1921. Serial No. 499,87Q.

useful improvements in internal combustion engines more especially of the type in which the valves are located in the cylinder heads.

The primary object of the invention is to provide improved means for actuating the valves wherein cushioning means is pro! vided for preventin the tapping action between the tappet ro and the valve stem and to make it easier to obtain an adjustment between the same so as to render the same noiseless.

The invention also includes within its scope certain structural details which provide a mounting for thetappet rods and the means for actuating the same. I

In describing my invention reference will be had to the accompanying drawings, in which Figure 1 is a side elevation of the upper portion of an engine embodying the invention and Figure 2 is a cross sectional view on the line 2 2 of Figure 1..

The engine comprises as usual a plurality of cylinders 5 in the heads of which are provided bearings 6 in which the stems 7 of the valves 8 are reciprocably mounted. The usual spring 9 is provided for each valve to normally retain the same on its seat. A tappet rod 10 is mounted in alignment with each valve stem and is actuated at the pro r time by a cam 11 carried on a shaft 12 which is driven through the beveled gearing 13 and counter-shaft 14 from the crank shaft of the engine and in properly timed relation thereto. The en ine head casting is formed with an upwardly extending portion 15 which carries bearings 16 for the shaft 12, and also provides seats for the blocks 17 which form bearings for the tappet rods.

Each tappet rod is formed of two telescoping sections 18 and 19 between which is seated an expansile spring 20 which urges the sections apart so as to keep the ends of the rod at all times in contact with the cam 11 and the end of the valve stem respectively. The lower section 19 is provided with an adjustable head21 which may be locked in position by the lock nut 22 so as to obtain the proper action between the tappet and the valve stem.

In adjusting the tappet rod the head 21 is adjusted to obtain the proper length and so that the tension of the spring 20 will be sufiicient to maintain the ends of the rod in contact with the cam and the end of the valve stem respectively but the pressure of the spring 20 should be slightly less than enough to overcome the tension of the spring 9 to open the valve. During the operation of the engine therefore, when the larger portion of the cam 11 comes in contact with the end of the tappet rod the spring 20 will be compressed until the sleeve portion 18 engages the shoulder 23 on the lower section of the rod. At this point the compression of the 'spring 20 will be just on the point of overcoming the pressure of the spring 9 so that there will be noperceptible shock as the sleeve 18 engages the shoulde'r23 and positively opens the valve. It will be seen therefore that'the ta-ppet rod may be very easily adjusted so as to render its operation practically noiseless. There will be no blow between the tappet rod and the valve stem since they are always in contact and there will be practically no blow between the sleeve 18and shoulder 23 owing to the cushioning efi'ect of the spring 20. The tappet rods may also be readily removed owing to the improved means for mounting the same in removable blocks 17. The entire mechanism including the tappet rods and cam shaft may also be enclosed by a protecting housing as indicated in broken lines at 24:.

I claim as my invention In an internal combustion engine, the combination of a plurality of widely spaced bearings, a cam shaft supported in said bearings and extendin longitudinally above the upper portion of the engine body, a plurality ofca-mscarried by said shaft, a tapwet member having a centrally bored tappet provided with a smooth continuous sur ace throughout its length and having a closed end adapted to be directly enged by said cams, the bore of said tappet 0- of uniform diameter throughout the entire length of said bore, an internally screw threadedtubular member, a coil compression spring in the lower part of said bore confined between the top of said tubular memher and the bottom of said bore and acting to unseat said tubular member, a nut-shaped shoulder integral with the bottom end of said tubular member adapted to seat on the lower end of the tapped body, a valve actuating bolt threaded in said tubular member, bearing blocks having apertures therethrough adapted to receive and guide said tappet mem ers, and having laterally directed apertured flanges, and bolts passing through the apertures in said flanges and securing said flanges to the engine body, said bearing blocks being located between the bearings for said cam shaft, whereby when said end cam shaft and bolts are removed, said blocks may be slipped directly upwardly from said tappet members.

In testimony that I claim the foregoing I have hereunto set my hand at Anti o, in the county of Langlade and State of l/ isoonsin.

ELMER TUTTLE. 

